na-adjective, noun
empty; hollow; insubstantial; fruitless
Describes arguments, discussions, theories, or plans that lack real content, substance, or practical results. Often used in critical or analytical contexts.
彼の提案は空疎で、具体的な内容がなかった。
His proposal was hollow and lacked concrete details.
空疎な
Continuing fruitless discussions won't produce anything.
Compound of 空 (empty) and 疎 (sparse, neglect). The combination emphasizes a lack of dense or substantial content, used figuratively for ideas and arguments.